and Leishmania mexicana, mNeonGreen emerged as the brightest single-copy green fluorescent protein, providing exceptionally strong signal intensity for live-cell imaging. It also demonstrated outstanding photostability, making it ideal for time-lapse microscopy where consistent brightness over time is essential. Unlike many other FPs, mNeonGreen maintained a strong signal even after chemical fixation, highlighting its versatility for both live and fixed imaging workflows. The plasmid system used in the study was successfully applied in L. mexicana, validating mNeonGreen’s cross-species functionality in trypanosomatids. Notably, mNeonGreen is exclusively licensed to Allele Reagents, who provide it in a variety of formats for advanced cellular imaging applications.
mScarlet & mScarlet3
The study also evaluated red fluorescent proteins, where mScarlet showed high intrinsic brightness but revealed a critical limitation, slow maturation, which led to misleading results in dynamic localization experiments. This was particularly evident when early-stage protein expression appeared absent, despite correct tagging. To overcome this, researchers turned to mScarlet-I, a fast-folding variant that restored accurate localization patterns. Building on these improvements, mScarlet3, available from Allele Reagents, offers even faster folding, enhanced brightness, and improved photostability compared to its predecessors. While not directly tested in the study, mScarlet3 is designed to address the performance issues seen with earlier red FPs, making it an ideal partner for mNeonGreen in dual-color imaging setups and FRET assays. Together, these tools offer researchers unparalleled clarity and confidence in protein localization studies.
Why This Matters
While in vitro data like quantum yield or extinction coefficient often guide fluorescent protein selection, this study highlights a crucial truth: real-world cellular performance is what ultimately determines experimental success. Brightness on paper doesn’t always translate to usable signal inside a living cell—factors like maturation speed, stability after fixation, photobleaching resistance, and protein folding behavior all dramatically influence outcomes.
The research demonstrated that widely used fluorescent proteins, such as mCherry and mScarlet, can underperform due to slow folding or poor photo-stability, potentially leading to misinterpretation of localization or expression timing. Conversely, well-engineered proteins like mNeonGreen and mScarlet3 shine in real applications offering bright, stable, and reliable signals across species and imaging conditions.
This is especially important for experiments involving dynamic cellular processes, co-localization studies, or cross-species comparisons, where misleading fluorescence can derail conclusions. Choosing validated, high-performance tags like those offered by Allele Reagents ensures confidence in your data—and saves time, effort, and cost down the line.
Allele Reagents Offers:
mNeonGreen, mScarlet, and mScarlet3 as recombinant proteins, expression plasmids, and labeling kits. Compatible with applications including live-cell imaging, protein tracking, and fluorescence microscopy. Elevate your experiments with Allele’s trusted fluorescent proteins, engineered for clarity, stability, and brilliance.
